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Finding the Fourth Proportional to 4,800.78, 7,201.12 and 1,338.02

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Solution

The fourth proportional to 4,800.78, 7,201.12 and 1,338.02 is: 2,007.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,800.78 : 7,201.12 = 1,338.02 : x
  2. Step 2: Convert to fraction form
    4,800.78/7,201.12 = 1,338.02/x
  3. Step 3: Cross multiply
    4,800.78x = 7,201.12 × 1,338.02
  4. Step 4: Simplify right side
    4,800.78x = 9,635,242.58
  5. Step 5: Solve for x
    x = 9,635,242.58/4,800.78
  6. Step 6: Final answer
    x = 2,007.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.